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https://www.readbyqxmd.com/read/28651057/how-to-identify-plasmons-from-the-optical-response-of-nanostructures
#1
Runmin Zhang, Luca Bursi, Joel D Cox, Yao Cui, Caroline M Krauter, Alessandro Alabastri, Alejandro Manjavacas, Arrigo Calzolari, Stefano Corni, Elisa Molinari, Emily A Carter, F Javier Garcia de Abajo, Hui Zhang, Peter Nordlander
A promising trend in plasmonics involves shrinking the size of plasmon-supporting structures down to a few nanometers, thus enabling control over light-matter interaction at extreme-subwavelength scales. In this limit, quantum-mechanical effects, such as nonlocal screening and size quantization, strongly affect the plasmonic response, rendering it substantially different from classical predictions. For very small clusters and molecules, collective plasmonic modes are hard to distinguish from other excitations such as single-electron transitions...
June 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28650820/terahertz-channel-model-and-link-budget-analysis-for-intrabody-nanoscale-communication
#2
Hadeel Elayan, Raed M Shubair, Josep M Jornet, Pedram Johari
Nanosized devices operating inside the human body open up new prospects in the healthcare domain. In vivo wireless nanosensor networks (iWNSNs) will result in a plethora of applications ranging from intrabody health-monitoring to drug- delivery systems. With the development of miniature plasmonic signal sources, antennas and detectors, wireless communications among intrabody nanodevices will expectedly be enabled at both the Terahertz Band (0.1-10 THz) as well as optical frequencies (400-750 THz). This result motivates the analysis of the phenomena affecting the propagation of electromagnetic signals inside the human body...
June 22, 2017: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/28649960/gold-nanoparticles-decorated-electrospun-poly-n-vinyl-2-pyrrolidone-nanofibers-with-tunable-size-and-coverage-density-for-nanomolar-detection-of-single-and-binary-component-dyes-by-surface-enhanced-raman-spectroscopy
#3
Alfin Kurniawan, Meng-Jiy Wang
The application of the electrospun nanomaterials to surface-enhanced Raman spectroscopy (SERS) is a rapidly evolving field which holds potential for future developments in the generation of portable plasmonic-based detection platforms. In this study, a simple approach to fabricate electrospun poly(N-vinylpyrrolidone) (PVP) mats decorated with gold nanoparticles (AuNPs) by combining electrospinning and calcination was presented. AuNPs were decorated on the fiber mat surface through electrostatic interactions between positively charged aminosilane groups and negatively charged AuNPs...
June 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28648818/evaluation-of-the-preimplantation-worksheet-in-determining-calypso-eligibility-for-men-prescribed-postprostatectomy-radiotherapy-with-electromagnetic-transponder-guidance
#4
Daniel George Hamilton, Kingsley Jones, Kevin So
This study aimed to assess the design and performance of the preimplant suitability worksheet in determining Calypso eligibility for prostate cancer patients prescribed postprostatectomy radiotherapy with electromagnetic transponder guidance. The medical records and radiotherapy planning datasets of 75 patients prospectively recruited between June 2015 and September 2016 to a Phase 2 trial evaluating electromagnetic transponder-guided postprostatectomy radiotherapy were retrospectively examined. Correlation and differences between computed tomography (CT)-defined greater trochanter and prostatic fossa landmarks were evaluated...
June 22, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28647287/microwave-thermal-ablation-effects-of-tissue-properties-variations-on-predictive-models-for-treatment-planning
#5
Vanni Lopresto, Rosanna Pinto, Laura Farina, Marta Cavagnaro
Microwave thermal ablation (MTA) therapy for cancer treatments relies on the absorption of electromagnetic energy at microwave frequencies to induce a very high and localized temperature increase, which causes an irreversible thermal damage in the target zone. Treatment planning in MTA is based on experimental observations of ablation zones in ex vivo tissue, while predicting the treatment outcomes could be greatly improved by reliable numerical models. In this work, a fully dynamical simulation model is exploited to look at effects of temperature-dependent variations in the dielectric and thermal properties of the targeted tissue on the prediction of the temperature increase and the extension of the thermally coagulated zone...
June 21, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28646801/the-effects-of-exposure-to-low-frequency-electromagnetic-fields-on-male-fertility
#6
Mahsa Darbandi, Sara Darbandi, Ashok Agarwal, Ralf Henkle, Mohammad Reza Sadeghi
Context • People are increasingly exposed to low frequency (LF) electromagnetic fields (EMFs), mainly from electricity distribution networks and electronic devices. Critics of this widespread exposure believe that it can have detrimental effects on the human body. On the other hand, many in vivo and in vitro studies have claimed that low frequency electromagnetic therapy can function as a form of alternative medicine and that therapists can treat disease by applying electromagnetic radiation or pulsed EMFs to the body or cells...
June 23, 2017: Alternative Therapies in Health and Medicine
https://www.readbyqxmd.com/read/28646483/from-novice-to-expert-analyzing-the-learning-curve-for-mri-transrectal-ultrasonography-fusion-guided-transrectal-prostate-biopsy
#7
R Mager, M P Brandt, H Borgmann, K M Gust, A Haferkamp, M Kurosch
PURPOSE: To investigate the learning curve of a novice in MRI/TRUS software fusion biopsy and to compare his results with the expert standard at our institution. METHODS: Overall 126 MRI/TRUS fusion-guided transrectal biopsies were performed using an electromagnetic tracking ultrasonography platform. The learning progress of the novice was evaluated comparing his initial 42 procedures (group A) with his following 42 (group B). The institution's expert standard (group C), which was compared to the novice's groups, was defined by the expert's experience of 42 MRI/TRUS fusion biopsies...
June 23, 2017: International Urology and Nephrology
https://www.readbyqxmd.com/read/28645965/the-perspective-of-european-researchers-of-national-occupational-safety-and-health-institutes-for-contributing-to-a-european-research-agenda-a-modified-delphi-study
#8
Diana Gagliardi, Bruna M Rondinone, Marco Mirabile, Giuliana Buresti, Peter Ellwood, Michel Hery, Peter Paszkiewicz, Antonio Valenti, Sergio Iavicoli
OBJECTIVES: This study, developed within the frame of the Partnership for European Research on Occupational Safety and Health joint research activities and based on the frame designed by the 2013 European Agency for Safety and Health at Work (EU-OSHA) study, is the first example of using the points of view of European occupational safety and health (OSH) researchers.The objective is to identify priorities for OSH research that may contribute to the achievement of present and future sustainable growth objectives set by the European strategies...
June 23, 2017: BMJ Open
https://www.readbyqxmd.com/read/28644818/fabrication-and-optical-properties-of-nanostructured-plasmonic-al2o3-au-al2o3-al2o3-metamaterials
#9
Hicham Bakkali, Eduardo Blanco, Manuel Dominguez, Jose S Garitaonandia
Discontinuous multilayer (DML) thin films, which consist of nano-granular metals (NGMs) embedded in a dielectric matrix, have attracted significant interest as engineered plasmonic metamaterials. In this study, a systematic layer-by-layer deposition of three-dimensional sub-wavelength periodic plasmonic DML structures via the radio frequency sputtering of a composite target has been reported. The overall optical response of the DML films composed of AuAl2O3 NGM homogenous layers, which are periodically sandwiched between two amorphous Al2O3 layers, are studied using reflection spectroscopic ellipsometry and transmission spectroscopy techniques...
June 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28644673/limitations-of-particle-based-spasers
#10
Günter Kewes, Kathrin Herrmann, Rogelio Rodríguez-Oliveros, Alexander Kuhlicke, Oliver Benson, Kurt Busch
We present a semiclassical analytic model for spherical core-shell surface plasmon lasers. Within this model, we drop the widely used one-mode approximations in favor of fully electromagnetic Mie theory. This allows for incorporation of realistic gain relaxation rates that so far are massively underestimated. Especially, higher order modes can undermine and even reverse the beneficial effects of the strong Purcell effect in such systems. Our model gives a clear view on gain and resonator requirements, as well as on the output characteristics that will help experimenters to design more efficient particle-based spasers...
June 9, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28643693/generation-mechanism-of-negative-permittivity-and-kramers-kronig-relations-in-batio-sub-3-sub-y-sub-3-sub-fe-sub-5-sub-o-sub-12-sub-multiferroic-composites
#11
Zhongyang Wang, Kai Sun, Peitao Xie, Yao Liu, Runhua Fan
Recently, negative parameters such as negative permittivity and negative permeability are attracting extensive attention for their unique electromagnetic properties. Usually, negative permittivity is well achieved by plasma oscillation of free electrons in conductor-insulator composites or metamaterials, while some attention has been drawn to attaining the negative permittivity in ceramics to reduce the dielectric loss. In this paper, negative permittivity in barium titanate and yttrium iron garnet composites was reported which was well fitted by Lorentz model...
June 23, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28643284/hydroxyl-radical-mediated-degradation-of-diclofenac-revisited-a-computational-approach-to-assessment-of-reaction-mechanisms-and-by-products
#12
Sesil Agopcan Cinar, Asu Ziylan-Yavaş, Saron Catak, Nilsun H Ince, Viktorya Aviyente
Advanced oxidation processes (AOPs) are based on the in situ production of hydroxyl radicals (•OH) and reactive oxygen species (ROS) in water upon irradiation of the sample by UV light, ultrasound, electromagnetic radiation, and/or the addition of ozone or a semiconductor. Diclofenac (DCF), one of the emerging organic contaminants (EOC), is of environmental concern due to its abundancy in water and is known to be subjected to AOPs. The current study uses density functional theory (DFT) to elucidate the mechanisms of the reactions between •OH and DCF leading to degradation by-products, P1-P9...
June 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28642582/plasmonic-opals-observation-of-a-collective-molecular-exciton-mode-beyond-the-strong-coupling
#13
Pierre Fauché, Christian Gebhardt, Maxim Sukharev, Renaud A L Vallée
Achieving and controlling strong light-matter interactions in many-body systems is of paramount importance both for fundamental understanding and potential applications. In this paper we demonstrate both experimentally and theoretically how to manipulate strong coupling between the Bragg-plasmon mode supported by an organo-metallic array and molecular excitons in the form of J-aggregates dispersed on the hybrid structure. We observe experimentally the transition from a conventional strong coupling regime exhibiting the usual upper and lower polaritonic branches to a more complex regime, where a third nondispersive mode is seen, as the concentration of J-aggregates is increased...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28642559/little-evidence-to-support-or-refute-interventions-for-the-management-of-burning-mouth-syndrome
#14
Debra K Fischoff, Silvia Spivakovsky
Data sourcesCochrane Oral Health's Trials Register, Cochrane Central Register of Controlled Trials (CENTRAL), Medline Ovid, Embase Ovid, US National Institutes of Health Ongoing Trials Register (ClinicalTrials.gov) and the World Health Organization International Clinical Trials Registry Platform. Handsearch of the proceedings from the British Society for Oral Medicine (BSOM), British Society for Dental Research (BSDR) and the International Association for Dental Research (IADR).Study selectionAll included studies were randomised placebo controlled trials comparing a treatment to placebo with no language or year of publication restrictions...
June 23, 2017: Evidence-based Dentistry
https://www.readbyqxmd.com/read/28640628/oriented-gold-nanorods-and-gold-nanorod-chains-within-smectic-liquid-crystal-topological-defects
#15
Brigita Rožič, Jérôme Fresnais, Celine Molinaro, Joseph Calixte, Shivakumar Umadevi, Stephanie Lau-Truong, Nordin Felidj, Tobias Kraus, Fabrice Charra, Vincent Dupuis, Torsten Hegmann, Celine Fiorini-Debuisschert, Bruno Gallas, Emmanuelle Lacaze
We show that the use of oriented linear arrays of smectic A defects, the so-called smectic oily streaks, enables the orientation of gold nanorods (GNRs) for a large range of GNR diameters, ranging from 7 to 48 nm, and for various ligands. For the small GNRs it enables oriented end-to-end small chains of GNRs when the density is increased from around 2 GNRs/μm(2) to around 6 GNRs/μm(2). We have characterized the orientation of single GNRs by spectrophotometry and two-photon luminescence (TPL). A strongly anisotropic absorption of the composites and an on-off switching of GNR luminescence, both controlled by incident light polarization, are observed, revealing an orientation of the GNRs mostly parallel to the oily streaks...
June 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28640583/fluffy-and-ordered-graphene-multilayer-films-with-improved-electromagnetic-interference-shielding-over-x-band
#16
Zicheng Wang, Renbo Wei, Xiaobo Liu
Highly ordered nitrogen-doped graphene multilayer films with large interlayer void are successfully fabricated by thermal annealing the compact stacking graphene oxide/copper phthalocyanine (GO/CuPc) multilayer films. Scanning electron microscopic (SEM), X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopic (XPS) and electrical conductivity measurements indicate that the breakaway of oxygen functional groups on/in the GO sheets at high temperature and the in-situ pyrolysis of CuPc molecules in the interlayer of graphene sheets synergistically facilitate the restoration of GO in graphitization, the effective nitrogen doping by replacing carbon atoms in graphene frameworks, the retention of layer-by-layer stacking structure of graphene sheets in plane and the formation of interlayer voids, leading to the enhancement in the electrical conductivity (3...
June 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28640462/hybrid-lead-halide-perovskites-for-ultrasensitive-photoactive-switching-in-terahertz-metamaterial-devices
#17
Manukumara Manjappa, Yogesh Kumar Srivastava, Ankur Solanki, Abhishek Kumar, Tze Chien Sum, Ranjan Singh
The recent meteoric rise in the field of photovoltaics with the discovery of highly efficient solar-cell devices is inspired by solution-processed organic-inorganic lead halide perovskites that exhibit unprecedented light-to-electricity conversion efficiencies. The stunning performance of perovskites is attributed to their strong photoresponsive properties that are thoroughly utilized in designing excellent perovskite solar cells, light-emitting diodes, infrared lasers, and ultrafast photodetectors. However, optoelectronic application of halide perovskites in realizing highly efficient subwavelength photonic devices has remained a challenge...
June 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28640306/tip-enhanced-raman-spectroscopy-from-early-developments-to-recent-advances
#18
REVIEW
Tanja Deckert-Gaudig, Atsushi Taguchi, Satoshi Kawata, Volker Deckert
An analytical technique operating at the nanoscale must be flexible regarding variable experimental conditions while ideally also being highly specific, extremely sensitive, and spatially confined. In this respect, tip-enhanced Raman scattering (TERS) has been demonstrated to be ideally suited to, e.g., elucidating chemical reaction mechanisms, determining the distribution of components and identifying and localizing specific molecular structures at the nanometre scale. TERS combines the specificity of Raman spectroscopy with the high spatial resolution of scanning probe microscopies by utilizing plasmonic nanostructures to confine the incident electromagnetic field and increase it by many orders of magnitude...
June 22, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28640188/novel-concrete-temperature-monitoring-method-based-on-an-embedded-passive-rfid-sensor-tag
#19
Yongsheng Liu, Fangming Deng, Yigang He, Bing Li, Zhen Liang, Shuangxi Zhou
This paper firstly introduces the importance of temperature control in concrete measurement, then a passive radio frequency identification (RFID) sensor tag embedded for concrete temperature monitoring is presented. In order to reduce the influences of concrete electromagnetic parameters during the drying process, a T-type antenna is proposed to measure the concrete temperature at the required depth. The proposed RFID sensor tag is based on the EPC generation-2 ultra-high frequency (UHF) communication protocol and operates in passive mode...
June 22, 2017: Sensors
https://www.readbyqxmd.com/read/28638137/optimized-microwave-illusion-device
#20
Benjamin Vial, Max Munoz Torrico, Yang Hao
We report the design, fabrication and experimental verification of an illusion device working at microwave frequencies. A two dimensional topology optimization procedure is employed to find the binary layout of a dielectric coating that, when wrapped around a metallic cylinder, mimics the scattering from a predefined, arbitrarily-shaped dielectric object. Fabrication is carried out with 3D-printing and spatially resolved near field measurements in a waveguide configuration were performed, allowing us to map the illusion effect...
June 21, 2017: Scientific Reports
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